BPSC – Combined Competitive Examination · પ્રશ્ન 63
Which of the following is the first artificially prepared element?
જવાબ બતાવો અને સમજૂતી
જવાબ: (B) Tc (Technetium)
સમજૂતી
Technetium (Z = 43) was produced by Perrier and Segrè in 1937; its name means 'artificial'.
- (A) ખોટો
Wrong: a naturally occurring element.
- (B) સાચો
Correct: technetium (1937) was the first element made artificially.
- (C) ખોટો
Wrong: a natural radioactive element.
- (D) ખોટો
Wrong: a naturally occurring element.